/*  
  -- The Lime II Project -- 

  A tuplespaces-based middleware for coordinating agents and mobile hosts.
  Copyright (C) 2005.
  Gian Pietro Picco, Amy L. Murphy, Lorenzo Bellini.

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received this copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 
 */

package lime2.trackerca;
import lime2.*;
import java.util.*;

/**
 * Advertises this LimeServer and detects the other hosts by means of a beaconing mechanism.
 * 
 * @author Gian Pietro Picco
 * @author Amy Murphy
 * @author Lorenzo Bellini 
 */

class TrackerPlainDetector 
{
	// private data members	
	private Hashtable cStatus;    // all engaged hosts: [LimeServerID,Long] where Long is a timestamp
	private Hashtable engaged;    // hosts that engaged during the last time quantum: [LimeServerID,LimeServerID]
	private Hashtable disengaged; // hosts that disengaged during the last time quantum: [LimeServerID,LimeServerID]

	/**
	 * Constructor method.
	 */
	TrackerPlainDetector()
	{
		cStatus = new Hashtable();
		engaged = new Hashtable();
		disengaged = new Hashtable();
		Init();	
	}
	private void Init()
	{
		List<LimeServerID> neighbors=TrackerPlainCA.engagedlist.get((LimeServerID)(LimeServer.getServer().getServerID()));
		if(neighbors!=null)
		{
		for(int i=0;i<neighbors.size();i++)
		{
			engaged.put(neighbors.get(i), neighbors.get(i));
			cStatus.put(neighbors.get(i),new Long(new Date().getTime()));
		}
		Iterator itr = TrackerPlainCA.serverlist.values().iterator();
		while(itr.hasNext())
		{
			LimeServerID disconnectedServer=(LimeServerID)itr.next();
			if(!neighbors.contains(disconnectedServer))
			{
				if(!disconnectedServer.equals((LimeServerID)(LimeServer.getServer().getServerID())))
				disengaged.put(disconnectedServer, disconnectedServer);
			
			}
		}
		Iterator it=engaged.keySet().iterator();
		while(it.hasNext())
		{
		LimeServerID iff=	(LimeServerID)(it.next());
		System.out.println("engaged server: "+iff.getHost()+": "+iff.getPort());
		}
		}
	}
}
	
		


